I decided on getting this gun since it does NOT use the ejecting shotgun shells that the Defender II uses. The down side is the magazine only carries 18 bb's which gives you only 6 shots since it shoots 3 bb's at a time. You can easily alter the bolt to feed only 1 shot at a time though.

This gun wil take greengas no problem and the blow back is pretty insane. 1 problem using green gas is the piston head blows back so fast that it will only allow a single bb to load even with the 3 bb piston in place.

Maruzen – M1100 Defender + M4 Collapsibel Stock and Grip System

BUT the real reason I bought this was to modify and add a Real Steel, M4 Stock and Grip system to this gun. EDIT: This project was scrapped and moved to a Maruzen CA870.

This SPAS12 was "Mis-Firing"/Broken when I purchased it second hand. I originally was only going to buy it for the folding metal stock (Since they are hard to find), and buy a new SPAS12, but I found the spare parts being sold at Dentrinity, so I decided to repair/upgrade the unit.